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DYNAMIC
TESTING |
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ISO/SAE Testing
ISO/SAE-Modified
Surrogate Wheelchair with Q'Straint tie-downs and restraints
with 50th Percentile Male. Conducted by the University of Michigan
Transportation Institute.
Sled Test Setup
Test #QS9602
Wheelchair Restraint: Q'Straint 4-point tie-down
Occupant Restraint: Q'Straint 3-point restraint
Wheelchair type: ISO (SAE modified) surrogate wheelchair
Test Dummy: 50th percentile male at 76 kg (168 lb)
Orientation: Forward facing
Sled Platform: Rigid Steel Plate
Desired crash pulse: 48 kph (30 mph)
Desired average sled deceleration: 20 G's
Test results
Test #QS9602
Actual velocity differential: 46.3 kph (28.8 mph)
Actual sled deceleration: 21.3 G
Crash pulse duration: 76.5 ms
Peak force left lap belt: 10201 N (2293 lb)
Peak force left rear tie-down: 28174 N (6334 lb)
Peak force right rear tie-down: 30096 N (6766 lb)
Peak force shoulder belt: 10263 N (2307 lb)
Peak resultant chest: 57 G's
Peak resultant head: 57 G's
Head injury 525 |
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Conclusion
The Q'Straint on-track four-point, strap-type tie-down system
successfully restrained the surrogate wheelchair during impact.
Both the wheelchair and ATD were in an upright position at the
completion of the test, and the ATD remained in the seated posture.
The maximum forward excursion of point P on the wheelchair was
76 mm, which is below the recommended upper excursion limit
of 200 mm.
The ATD was effectively restrained
by the Q'Straint 3-point belt system during the test.
The ATD was limited to 353 mm of head excursion and 274 mm of
knee excursion, which are both below the recommended upper excursion
limits of 650 mm and 375mm, respectively. The ration of knee
excursion to wheelchair excursion is 3.6, which is above the
minimum recommended ratio of 1.1. None of the wheelchair tie-down
and occupant restraint components showed evidence of fragmentation
or separation. The wheelchair
tie-down and occupant restraint system remained attached at
all anchorage and securement points. |
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